In order to release THC from cannabis, the cannabis should be heated up, often by the smoking it. The body absorbs 10-25% of the THC when it is inhaled and only 6% when it is eaten. The dose of THC required for a person to feel high is around 10 milligrams, of which only a small fraction reaches the brain. A week after having smoked cannabis only 60-70% of the THC has left the body because it is stored in body fat. It takes about 4-6 weeks before the THC is no longer visible in a blood test. The psychoactive effects, on the other hand, disappears after a few hours. THC or decomposition products can be detected in urine up to a few days after the last use. This time, however, longer for chronic users, THC which can be seen in the urine up to a few weeks after the last used.
The hair can detect THC for as long as the longest hair has grown, plus a few more weeks.
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